Spatial multiplexing in optical feeder links for high throughput satellites

Gharanjik, Ahmad; Liolis, Konstantinos; Shankar, M. R. Bhavani; Ottersten, Björn

doi:10.1109/globalsip.2014.7032294

Cited by 16 publications

(20 citation statements)

References 6 publications

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“…Since the limited spectrum available in Ku-Ka bands may not be sufficient to ensure Terabit/s communications by means of efficient frequency reuse alone, most feeder link studies focus on moving to higher frequency bands (Radio Frequency (RF) bands like Q/V (40/50 GHz), [3][4][5][6] W (70/80GHz) 7 or even Optical. [8][9][10] Free Space Optics (FSO) communications represent an interesting alternative due to the following advantages over RF:…”

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confidence: 99%

Exploiting Diversity in Future Generation Satellite Systems with Optical Feeder Links

Mengali

Kayhan

Shankar

et al. 2016

34th AIAA International Communications Satellite Systems Conference

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In this paper we exploit the transmitter micro diversity in the satellite communication systems with optical feeder links. Both analogue and digital transparent systems are studied. We consider up to four statistically independent transmitted optical beams with perfect or partial phase knowledge of the beams at the receiver. End-to-end simulation results for frame error rates are presented for a complete system including uplink, satellite payload and downlink. We compare our results with those of the DVB-S2 standard without the optical feeder link. Our results provide a complete view of gains and losses which can be obtained by micro diversity in both analogue and digital transparent satellite systems with optical feeder link. Given the system parameters, we also provide a detailed study of the transmitted power needed to achieve a target frame error rate and discuss the achieved bit rates in for each system scenario.

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mentioning

confidence: 99%

Exploiting Diversity in Future Generation Satellite Systems with Optical Feeder Links

Mengali

Kayhan

Shankar

et al. 2016

34th AIAA International Communications Satellite Systems Conference

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“…A typical ground segment network with optical ground stations is depicted in Figure 1. As discussed in [2], the overall traffic can be divided between (N) active OGS, using smart gateway diversity techniques. A number of redundant OGS (P) is needed in order to achieve the required aggregate feeder link availability.…”

Section: Ogs Site Diversitymentioning

confidence: 99%

“…The binomial model corresponds to the case where all OGS sites are assumed to be independent from each other, and where the probability of CFLOS per site is 80% at any time, reflecting typical CFLOS performance from Table 2. The aggregated CFLOS availability follows a binomial distribution as a function of N and P. This model was analysed in [2] and the results have been extended in Figure 3 for higher availabilities and for higher values of N, where the probability distribution tends to become Gaussian. The expected statistical gain, corresponding to a decrease of P/N as N increases, can be seen especially for the first values of N and for the binomial distribution.…”

Section: Icso 2018 International Conference On Space Opticsmentioning

confidence: 99%

“…The amount of redundancy needed, both at system level (N+P dimensioning of OGS network) and inside the OGS gateway, reduces in a distributed approach (N>1). Further savings can be envisaged in the digital part, for instance by moving digital processing functions (N+P elements) to a central place where only N active elements are needed, but requiring dedicated connectivity between all OGS, as discussed in [2]. Section 4 presents the economical aspects of these different options.…”

Section: Ground Segmentmentioning

confidence: 99%

“…While there is clear interest to use optical communications in VHTS feeder links ( [1], [2], [3]), thanks to their very large capacity, several challenges need to be resolved before they can be adopted by satellite operators. A companion paper in the same conference [4] investigates different options for the feeder link technologies and presents several solutions for the satellite payload.…”

Section: Introductionmentioning

confidence: 99%

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Optical feeder link architectures for very HTS: ground segment

Girault¹,

Arapoglou²

2019

International Conference on Space Optics — ICSO 2018

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The paper deals with an analysis of Very High Throughput Satellite (VHTS) systems employing optical feeder links. As the capacities of newly announced next generation VHTS systems are exceeding the Terabit/s barrier, a large amount of investment needs to be directed not only to the space segment (as was the case traditionally), but also to the ground segment in support of the feeder links. To reduce this investment, satellite operators are reviewing various options and technologies for the feeder links, among which optical feeder links [1]. In this paper, different approaches are analysed for ground segment networks relying on Optical Ground Stations (OGS), exploring the concept of smart gateway diversity with N active OGS and P redundant ones, like is currently done in VHTS systems with RF feeder links. OGS locations are assessed in terms of aggregate availability and total cost for the satellite operator, which is an essential element for the viability of the VHTS system. Different options are assessed for the distribution of OGS gateway processing functions (local at OGS or centralised), and for their interconnection. The main technical challenges are discussed, identifying which technologies will be required for an operational VHTS system with OGS.

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Ground‐to‐GEO optical feeder links for very high throughput satellite networks: Accent on diversity techniques

Mengali

Kourogiorgas

Lyras

et al. 2020

Satell Commun Network

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This paper studies the use of optical feeder links in very high throughput satellites (VHTS) networks with emphasis on gateway diversity techniques to mitigate the inherent propagation losses in optical frequencies. Focusing on a GEO scenario, the paper considers a system-wide approach investigating various challenges of optical feeder links. These include transmission schemes amenable for transparent on-board processing, optical channel models taking into account blockage by clouds and fading caused by atmospheric turbulence in addition to complexity of on-board and on-ground processing. The channel models are then used to dimension the ground segment towards ensuring a given availability percentage (e.g., 99.9%). The channel model and payload complexity further influence the choice of link layer techniques used for counteracting fading due to atmospheric turbulence in the absence of blockage. An elaborate end-to-end simulator incorporating the proposed channel models capturing the nuances of various processing blocks like optical-electrical conversion is developed. The system performance results provide interesting insights and a framework for assessing the feasibility and advantages of optical feeder links in VHTS systems. K E Y W O R D Sanalog and digital transparent payloads, channel models, GEO networks, microdiversity and macrodiversity, optical feeder links, optical ground station network selection, optical received time series, optical SNR | INTRODUCTIONA key challenge towards future generation very high throughput satellites (VHTS) is the limited spectrum of about 2 GHz available in the Ka band (20/30 GHz). A potential solution for resolving this issue could be to move the feeder links from the Ka band to the Q/V band (40/50 GHz) 1-4 or even to the W band (70/80 GHz) 5 where bandwidths of up to 5 GHz are available. While this allows for the use of radio frequency (RF) domain expertise, the bandwidth available is limited compared with requirement estimates and the spectrum is also solicited in the emerging 5G paradigm. 6 Another revolutionary solution is to move the feeder link from RF frequencies to optical frequencies. [7][8][9] Both these approaches are challenging due to the attenuation by atmospheric phenomena (e.g., rain and clouds) whose severity increases with the frequency. In both cases, a network of multiple gateways with smart switching capabilities is thus envisaged. 10,11 While RF at high frequencies is less impaired than the optical counterpart, larger number of gateways is nonetheless required to achieve very high throughputs due to the limited available bandwidth per

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Spatial multiplexing in optical feeder links for high throughput satellites

Cited by 16 publications

References 6 publications

Exploiting Diversity in Future Generation Satellite Systems with Optical Feeder Links

Exploiting Diversity in Future Generation Satellite Systems with Optical Feeder Links

Optical feeder link architectures for very HTS: ground segment

Ground‐to‐GEO optical feeder links for very high throughput satellite networks: Accent on diversity techniques

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